16621620620 has 24 divisors (see below), whose sum is σ = 38078622288. Its totient is φ = 6044225600.

The previous prime is 16621620607. The next prime is 16621620671. The reversal of 16621620620 is 2602612661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37776191 + ... + 37776630.

It is an arithmetic number, because the mean of its divisors is an integer number (1586609262).

Almost surely, 2^16621620620 is an apocalyptic number.

16621620620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16621620620 is an abundant number, since it is smaller than the sum of its proper divisors (21457001668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16621620620 is a wasteful number, since it uses less digits than its factorization.

16621620620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75552841 (or 75552839 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 16621620620 in words is "sixteen billion, six hundred twenty-one million, six hundred twenty thousand, six hundred twenty".